Question

Why graphite anode is preferred to other inert electrode in electrolysis of fused lead bromide?

Answer 1

the graphite anode is an inert electrode because it does not forms it own ions or do not take part in the chemical reaction ...whereas other than graphite anode...we can prefer using platinum electrode in the electrolysis of fused lead bromide. ...

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Answer 2

Question :-

Why graphite anode is preferred to other inert electrode in electrolysis of fused lead bromide?

Answer :-

The reactions of electrolysis of lead bromide include :

$\mathsf{Anode\implies Br^{1-}-1e^-\rightarrow Br}\\\\\implies \sf{Br+Br\rightarrow Br_2}$

$\sf{Cathode\implies Pb^{2+}+2e^-\rightarrow Pb}$

Hence these two reactions show that :

Ф The electrode should not participate in the reaction.

Ф The cathode is the electrode where the metal will be deposited.

Ф The anode is the electrode where the gas would evolve.

Ф The cathode as well as anode should be inert .

A graphite electrode is used in the reaction because :

(i) The graphite being inert does not react and it does not take part in the reaction.

(ii) The graphite does not affect the bromine vapours that are evolved .

The observations of the reaction are :

(i) Reddish brown fumes of bromine are evolved.

(ii) Silver grey metal is deposited at the cathode.